Valhalla up to 3.6.3 cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in Valhalla up to 3.6.3. Affected by this issue is some unknown functionality. The manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-49294. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Valhalla up to 3.6.3. It has been rated as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

Valhalla is an open source routing engine and accompanying libraries for use with OpenStreetMap data. Versions 3.6.3 and prior are vulnerable to reflected cross-site scripting (XSS) due to improper neutralization of input in the JSONP callback parameter. When a request specifies a JSONP callback, the value is reflected directly into the HTTP response body with Content-Type: application/javascript, without any validation, output encoding, or allowlist filtering. An attacker can craft a URL containing arbitrary JavaScript in the callback parameter; if a victim is induced to load that URL via a tag, the injected script executes in the context of the serving origin, potentially leading to session token theft, credential disclosure, or actions performed on behalf of the victim. This issue was not fixed at time of publication.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-49294 since 05/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Valhalla

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3

Website

• Product: https://github.com/valhalla/valhalla/

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